underlayer

• POS: Noun
• HYPHEN: un=der=lay=er

CIDE DICTIONARY

underlayer, n. 

•  One who, or that which, underlays or is underlaid; a lower layer.  [1913 Webster]
•  A perpendicular shaft sunk to cut the lode at any required depth.  Weale.  [1913 Webster]

THESAURUS

underlayer

band, bed, bedding, bedrock, belly, belt, bottom, bottom side, breech, buttocks, couche, course, deck, downside, floor, fundament, gallery, hardpan, layer, ledge, level, lower side, lowest layer, lowest level, measures, nether side, nethermost level, overlayer, overstory, rock bottom, seam, shelf, stage, step, story, stratum, substratum, superstratum, thickness, tier, topsoil, underbelly, underneath, underside, understory, understratum, zone